This is the Dynamite Reaction HyperCharge 7.4V, 10C Battery Pack. This 225mAh Reaction series DynamiteŽ LiPo battery utilizes a custom chemistry unlike any other battery on the market. Not only does this 225mAh LiPo battery deliver ample power, when charged with the Dynamite HyperCharge charger, it can be recharged at a 15C rate without overheating.